Office (OLE) / .XLS malware analysis — malicious · 9d889525c617e307

MALICIOUS

Office (OLE) / .XLS

2.34 MB Created: 2003-12-15 13:23:04

MD5: cd2d240e93cc9722c14a43a4e4624bd0 SHA-1: 542f054b5cddd0481de06937db8973481678ff25 SHA-256: 9d889525c617e30774cdee256839bba785680c8a2650ca948daa8a914e6e72cf

482 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is an XLS document that contains an embedded PE executable, identified by ClamAV as Win.Trojan.Agent-575075. Heuristics indicate the use of APIs such as CreateProcess, VirtualAlloc, VirtualProtect, WriteProcessMemory, LoadLibrary, and GetProcAddress, suggesting the malicious executable is loaded and executed. The embedded URL is likely used for command and control or to download additional payloads.

Heuristics 13

Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY

Reference to WriteProcessMemory API
Embedded PE executable critical OLE_EMBEDDED_EXE

MZ/PE header found inside document — possible embedded executable
ClamAV: Win.Trojan.Agent-575075 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-575075
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
NOP sled detected high SC_NOP_SLED

Found 20+ consecutive 0x90 bytes
x86 GetPC stub (CALL $+5; POP EBP) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EBP)
Reference to CreateProcess API high SC_STR_CREATEPROCESS

Reference to CreateProcess API
Reference to LoadLibrary API high SC_STR_LOADLIBRARY

Reference to LoadLibrary API
Reference to GetProcAddress API high SC_STR_GETPROCADDRESS

Reference to GetProcAddress API
Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC

Reference to VirtualAlloc API
Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT

Reference to VirtualProtect API
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://webs.uolsinectis.com.ar/suoem_sanfco

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_office_000020a1.exe` `9bdacde16ead15ac68d2d1dfdf69da1d9d87191e3b564e808c594a8543fbf10b`	embedded-pe	Office MZ+PE at offset 0x20A1	2445663 bytes
Detection ClamAV: Win.Trojan.Agent-575075 Obfuscation or payload: likely Carved artifact entropy is 7.76, consistent with packed or encrypted content.
`ole10native_00.bin` `cb93e0358e75adcf8262a5110068ec039a553556f439fd692fecbab3d70d85ea`	ole-package	OLE Ole10Native stream: MBD00BC19A0/Ole10Native	704674 bytes
Detection ClamAV: Win.Trojan.Agent-575075 Obfuscation or payload: likely Carved artifact entropy is 7.76, consistent with packed or encrypted content.
`ole10native_02.bin` `f10cc1cabbc55e0eb198c2a85df32849d0b3c52116e78e2d0129d09ace26797a`	ole-package	OLE Ole10Native stream: MBD01A43729/Ole10Native	704675 bytes
Detection ClamAV: Win.Trojan.Agent-575075 Obfuscation or payload: likely Carved artifact entropy is 7.76, consistent with packed or encrypted content.

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